Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2e71441f3c1351…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 11:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c68bfff1420b5bc906132b2e27f749eb SHA-1: 545cf860d1e5d21601541e765fe04793b83daa82 SHA-256: 1a2e71441f3c13518d4dc525498d74f5258a0a2fdf083f7667fb12a332d4f163
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, with a high concentration of links pointing to disposable hosting services, indicating a link farm designed to obscure the ultimate destination. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/award?keyword=immensee+storm+pdf+italiano PDF link annotation
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/a2c9ee7f88948.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/1552032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_60436dc8cd631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fc8738b1aa87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_6012302f3316f.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/YW5Jjf6/zobukadutexor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5fddaec71831c.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ePzk6cB/30356976842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_5fe948a939a32.pdfIn PDF document text
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/bejegalexaxomad_lazoj_wuxon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_60076e2b64b03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394068/normal_5ff0d0ac7e7b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df28a813-613c-44b0-bd94-9093a2b2a81a/livivezejuganotiletesuwo.pdfIn PDF document text
    • http://dikivila.epizy.com/love_wallpaper_wallpaper_cave._com.pdfIn PDF document text
    • http://dapobepopid.rf.gd/azur_lane_baltimore_gear_guide.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/aprende_ingles_facil_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d5ccf1-249d-4b11-9ab8-661ab6aca9b1/what_kind_of_battery_does_my_nissan_rogue_key_fob_take.pdfIn PDF document text
    • http://wujinagupiw.epizy.com/airshou_ios_12.pdfIn PDF document text
    • http://vezenupu.epizy.com/benefits_of_technology_in_business.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 5124 bytes
SHA-256: 5e32c509087cefecd47aec107bd99ad5af6aef897cf6acba78cd96f783d07351
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 12228 bytes
SHA-256: 3aa2d77e0c47aef0754eb30c6e062056d7f5d624da2890021646b719d7ac43b1

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